Me too have a Line6 PodXT, I needed it when I made covers with my band. We covered many songs at the beginning, and we moved toward a Pink Floyd cover band, so lots of effects needed.
Yes it is very cool, and extremely realistic even with bad SS amps (new Fenders, cheap ones).

I've also opened it once and saw that the main processor was Philips brand.

Now that I only play blues and a little jazz I'm thinking about selling it and build a tube amp... too much to carry it around.

(a little OT... you realize that you've spent too much time on hi-fi tube amps when you're looking at a Fender tube amp schematic and say: I would have done it better, what's that? Pentode mode? 12AX7??? )